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Designing soft/hard double network hydrogel microsphere/UHMWPE composites to promote water lubrication performance

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friction 2021年第3期9卷 551-568页

作者： Chaobao WANG Xiuqin BAI Conglin DONG Zhiwei GUO Chengqing YUAN Anne NEVILLE School of Energy and Power Engineering Wuhan University of TechnologyWuhan 430063China Key Laboratory of Marine Power Engineering&Technology(Ministry of Transport) Wuhan University of TechnologyWuhan 430063China Institute of Functional Surfaces School of Mechanical EngineeringUniversity of LeedsLeeds LS29JTUnited Kingdom

Several soft tissues residing in the living body have excellent hydration lubrication properties and can provide effective protection during relative *** order to apply this advantage of soft matters in practical applications and try to avoid its disadvantage,such as swelling and weakening in water,a design strategy of a soft/hard double network(DN)hydrogel microsphere modified ultrahigh molecular weight polyethylene(UHMWPE)composite is proposed in this study.A series of microspheres of urea-formaldehyde(UF),polyacrylamide(PAAm)hydrogel,UF/PAAm double network,and their composites were *** mechanical properties,swelling,wettability,friction properties,and the lubrication mechanisms of the composites were *** results show that DN microspheres can have an excellent stability and provide hydration *** performance of 75 DN-1 composite was superior to *** finding will provide a novel strategy for the development of water-lubricated materials and have wide application in engineering fields.

关键词： double network microsphere composite friction properties hydration lubrication

Effect of Rare Earths-Treated Glass Fiber on Impact Wear-Resistance of Metal-Plastic Multilayer Composites

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Journal of Rare Earths 2002年第4期20卷 282-286页

作者：程先华薛玉君谢超英 Sch. of Mech. Eng. Shanghai Jiaotong Univ. Shanghai 200030 China Sch. of Mat. Sci. and Eng. Shanghai Jiaotong Univ. Shanghai 200030 China

The friction and wear properties under impact load and dry friction conditions of metal-plastic multilayer composites filled with glass fiber, treated with rare earth elements, were investigated. The worn surfaces were observed and analyzed by scanning electron microscopy (SEM). It shows that applying rare earth elements surface modifier to treat the glass fiber surface can enhance the interfacial adhesion between the glass fiber and polytetrafluoroethylene (PTFE), as well as promote the interface properties of the composites. This helps to form a uniformly distributed and high adhesive transfer film on the counterface and abate the friction between the composite and the counterface. As a result, the wear of composite is greatly reduced. The composite exhibits excellent friction properties and impact wear-resistance.

关键词： rare earths metal-plastic multilayer composites friction properties impact wear-resistance

Excellent tribological properties of epoxy-Ti3C2 with three-dimensional nanosheets composites

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friction 2021年第4期9卷 734-746页

作者： Fanning MENG Zhenyu ZHANG Peili GAO Ruiyang KANG Yash BOYJOO Jinhong YU Tingting LIU Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

As a widely used engineering polymer,epoxy resin has been successfully employed in high-performance components and ***,the poor thermal and friction properties of traditional epoxy resin greatly limit its application in many extreme *** this work,a new kind of epoxy-Ti3C2 with three-dimensional nanosheets(3DNS)composite which was designed by freeze-drying method showed up excellent thermal and friction *** a result,the coefficient of thermal expansion(CTE)of epoxy-Ti3C23DNS 3.0 composites was 41.9 ppm/K at 40℃,which was lower than that of the traditional epoxy resin(46.7 ppm/K),and the thermal conductivity(TC)was also improved from 0.176 to 0.262 W/(m-K).Meanwhile,epoxy-Ti3C23DNS 1.0 composites showed up the best friction property,with wear rate 76.3%lower than that of epoxy *** work is significant for the research of high-performance composite materials.

关键词： epoxy-Ti3C23DNS composite three-dimensional nanosheets thermal performances friction properties

Impact Wear properties of Metal-Plastic Multilayer Composites Filled with Glass Fiber Treated with Rare Earth Element Surface Modifier

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Journal of Rare Earths 2001年第3期19卷 238-240页

作者：程先华薛玉君 Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200030 Peoples R China

The friction and wear properties of metal-plastic multilayer composites filled with glass fiber, which is treated with rare earth element surface modifier, under impact load and dry friction conditions were investigated. Experimental results show that the metal-plastic multilayer composite filled with glass fiber exhibits excellent friction and impact wear properties when using rare earth elements as surface modifier for the surface treatment of glass fiber.

关键词： rare earths metal-plastic multilayer composites friction properties impact wear properties

Application of ultra-smooth composite diamond film coated WC-Co drawing dies under water-lubricating conditions

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Transactions of Nonferrous Metals Society of China 2013年第1期23卷 161-169页

作者：沈彬孙方宏张志明沈荷生郭松寿上海交通大学机械与动力工程学院上海200240 上海交友钻石涂层有限公司上海200240

A specific revised HFCVD apparatus and a novel process combining HFCVD and polishing technique were presented to deposit the micro-and nano-crystalline multilayered ultra-smooth diamond（USCD） film on the interior-hole surface of WC-Co drawing dies with aperture ranging from d1.0 mm to 60 *** results indicate that the surface roughness values（Ra） in the entry zone,drawing zone and bearing zone of as-fabricated USCD coated drawing die were measured as low as 25.7,23.3 and 25.5 nm,***,the friction properties of USCD films were examined in both dry sliding and water-lubricating conditions,and the results show that the USCD film presents much superior friction *** friction coefficients against ball-bearing steel,copper and silicon nitride balls（d4 mm）,is always lower than that of microcrystalline diamond（MCD） or WC-Co sample,regardless of the lubricating ***,it still presents competitive wear resistance with the MCD ***,the working lifetime and performance of as-fabricated USCD coated drawing dies were examined under producing low-carbon steel pipes in dry-sliding and water-lubricating *** the water-lubricating drawing condition,its production significantly increases by about 20 times compared with the conventional WC-Co drawing dies.

关键词： CVD diamond coated drawing die ultra-smooth composite diamond(USCD) film friction properties water-lubricating drawing dry sliding water lubrication

friction COEFFICIENT OF CLUSTER DIAMOND-DISPERSED ALUMINUM COMPOSITE BY COMPRESSION SHEARING METHOD

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FRICTION COEFFICIENT OF CLUSTER DIAMOND-DISPERSED ALUMINUM C...

Surface Topography Optimization and Numerical Simulations of frictional Influences on the Formability

作者： Noboru Nakayama Hiroyuku Takeishi Dept. of Machine Intelligence and Systems Eng. Akita Prefectural UniversityYurihonjyo Akita 015-0055 JAPAN Dept.of Science and Mech.Eng. Chiba Inst. of Thech. NarashinoChiba 275-8588 JAPAN

＜正＞In this paper, pure Aluminum and cluster diamond-dispersed aluminum composites were made by the compression shearing method. The friction coefficient, density, mechanical properties, and microstructures of compacted powders were investigated. The addition of 1vol. % CD to Al improved the friction coefficient. The average friction coefficients of Al, 1 vol. % CD sample, and 5vol. % CD sample indicate 0.91, 0.71 and 0.83, respectively. Comparing with one of Al, these values are reduction of 22% and 9% , respectively. However, the 5vol % CD solidified by compression shearing method and dynamic compaction method shows an increase in friction coefficient. The pores can be observed at 5% CD sample. It is considered that the lubricating ability of the Al composite containing 5% CD decreases by the pores, consequently the friction coefficient is increased. In compression shearing, the oxidation layer formed on the Al powder surface was destroyed. However, the bonding of the powders was lower in hot press and dynamic compacting, since it was not possible to sufficiently destroy the oxidation layer. Therefore, the friction coefficient of composite material molded by compression shearing is lower than the one of composite material molded by hot press and dynamic compacting.

关键词： Cluster diamond friction properties Compression shearing method

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Surface Topography Optimization and Numerical Simulations of...

TCLP/SF/纳米酚醛树脂混杂复合材料的摩擦磨损性能研究

China 6th International Symposium on Tribology

作者： Yonghong Fu~* Hua Xu Xijun Hua Zhongling Wang Dongcheng Sun School of Mechanical Engineering Jiangsu University 212013

＜正＞This paper mainly discussed influences of the friction in different regions of dies on the formability of hemispherical *** simulations were performed to find out the areas where the friction has remarkable influences on the wrinkling and fracture of hemispherical parts by changing friction coefficients in different regions of ***,two groups of friction coefficients that were approximately optimized to reduce the risk of wrinkling and fracture respectively were applied to the *** simulation results demonstrated that the possibility of wrinkling was reduced by 5.2%and the possibility of fracture was reduced by 13%.Furthermore,the findings of this paper were useful for Laser Composite Texturing which was used to actively design and manufacture the micro-geometric texture on the surface of dies.

关键词： Hemispherical parts friction properties Formability FE simulations Laser Composite Texturing

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TCLP/SF/纳米酚醛树脂混杂复合材料的摩擦磨损性能研究